52 microcontroller based simple calculator program, there is a negative fractional arithmetic functions and display functions

TEST
....\ipch
....\....\test-d0945a17
....\....\.............\test-2434c52c.ipch
....\TEST
....\TEST.sdf
....\TEST.sln
....\TEST.suo
....\....\1602LCD.cpp
....\....\cal.h
....\....\keyboard.cpp
....\....\main.cpp
....\....\mathfunction.cpp
....\....\resource.h
....\....\TEST.APS
....\....\TEST.cpp
....\....\TEST.rc
....\....\TEST.vcxproj
....\....\TEST.vcxproj.filters
....\....\TEST.vcxproj.user
....\....\TEST1.cpp

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